Sofa



FIG. 1 is a perspective view of a sofa embodying my design;

FIG. 2 is a right end elevational view of FIG. 1; and

FIG. 3 is a top plan view of FIG. 1.

The left end is a mirror image of the right end, and the rear is plain and unornamented. 

The ornamental design for a sofa, as shown and described. 